Rework queue & direct matches

[FreddyMSchubert]

1. Introduce direct matches - go on any teams profile, click on "CHALLENGE THIS TEAM", and the battle shall commence. Each team has a toggle ("Disable Online Games") to disable this that is off by default, when it's activated you can't be challenged by others and also can't challenge others.
2. Build a proper elo that's actually representative of skill but keep it on the backend to not spoil the tournament
3. Instead of fully random queue, do a dynamic algorithm that matches you against somebody roughly your level:
   • Deprioritize the people you just played against, more the more recently you played against them
   • Prioritize people who are roughly your elo
   • Slightly prioritize people who have more recently played in matchmaking as well / who are active

Remove queue in its current form.

[PaulicStudios]

Possible solution for not having too many matches:
Each team can play as many matches as they want, but they have a limited match “credit” (e.g., 10 matches). Once they use up those credits, they can’t start new matches until credits regenerate—say, at a rate of 1 match credit per hour.